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JAMB Mathematics 2008 Question 29

Question 29

Circle Theorems

Find the angle subtended at the centre of a circle by a chord which is equal in length to the radius of the circle.

  1. A.30°
  2. B.45°
  3. C.60°
  4. D.90°
Show the answer and explanation

Answer: C (60°)

Explanation

The chord and the two radii form an equilateral triangle, so the angle at the centre is 60°.